Long-distance oil delivery precise metering control system and control method

Abstract

The invention discloses a long-distance oil liquid conveying accurate metering system and method and aims at solving the technical problems that the hydraulic impact is large and accurate metering cannot be achieved in long-distance oil transporting. The system comprises a control unit, an oil storage unit, a metering unit and an oil receiving terminal, wherein the oil storage unit, the metering unit and the oil receiving terminal are sequentially connected through an underground oil conveying pipeline. The oil storage unit comprises an oil tank and an oil-immersed pump. The metering unit comprises a filter, a balance valve, a first electromagnetic valve and a flow measuring transducer, which are sequentially arranged on the oil conveying pipeline. The oil receiving terminal comprises an oil gun, an oil conveying rubber pipe and a second electromagnetic valve arranged at the front end of the oil conveying rubber pipe. By means of the long-distance oil liquid conveying accurate metering system and method, the balance valve and the first electromagnetic valve are arranged in front of the flow measuring transducer, the second electromagnetic valve is arranged at the oil receiving terminal, the main valve closing lead of the two electromagnetic vales can be increased properly, and therefore pressure impacts are effectively controlled, adverse influences of the pressure impacts on all parts are weakened, and accurate metering of long-distance oil conveying is achieved.

Description

technical field [0001] The invention relates to the technical field of refueling equipment control, in particular to a long-distance oil delivery precise metering control system and control method. Background technique [0002] The traditional fuel dispenser adopts an integrated design and a compact layout. With the increasing degree of informatization, its lack of scalability restricts the planning and development of gas stations. In order to increase the scalability of the tanker, a long-distance oil delivery mode can be designed to separate the oil delivery power pump and metering unit from the oil receiving terminal. The metering unit is placed in an area far away from the refueling island. oil terminal. The slimming of the oil receiving terminal has enhanced the flexibility of the gas station layout, improved the effective utilization rate of the land area, and expanded a series of non-fueling businesses to meet the needs of gas station information construction. Howev...

AI Technical Summary

Problems solved by technology

However, there is a problem of hydraulic shock in long-distance oil delivery. After the system finishes refueling the oil container, the oil gun is closed, and the liquid flow suddenly stops. Due to the action of the flowing liquid and the inertia of the moving parts, its kinetic energy becomes from the stop point. High pressure waves, and pass back and forth in the piping system, also known as the phenomenon of water hammer

The main factor affecting the size of the hydraulic shock is the distance from the metering unit to the nozzle of the oil gun. The farther the distance is, the greater the shock will be. The hydraulic shock will cause many adverse effects. The pressure difference in the two sections of the pipeline before and after the metering unit will make the oil Push the flowmeter to reverse, which affects the measurement accuracy; the impact pressure exceeds the closing pressure of the oil gun valve, and more oil will be released; no matter whether it is oil backflow or multiple shots, the phenomenon of lifting the gun and counting when the next refueling will occur

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